1 /*
2 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
3 * are not related to any other subsystem
4 *
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 *
7 * This file is release under the GPLv2
8 *
9 */
10
11 #include <linux/config.h>
12 #include <linux/kobject.h>
13 #include <linux/string.h>
14 #include <linux/sysfs.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17
18 #define KERNEL_ATTR_RO(_name) \
19 static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
20
21 #define KERNEL_ATTR_RW(_name) \
22 static struct subsys_attribute _name##_attr = \
23 __ATTR(_name, 0644, _name##_show, _name##_store)
24
25 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
26 /* current uevent sequence number */
27 static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page)
28 {
29 return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum);
30 }
31 KERNEL_ATTR_RO(uevent_seqnum);
32
33 /* uevent helper program, used during early boo */
34 static ssize_t uevent_helper_show(struct subsystem *subsys, char *page)
35 {
36 return sprintf(page, "%s\n", uevent_helper);
37 }
38 static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count)
39 {
40 if (count+1 > UEVENT_HELPER_PATH_LEN)
41 return -ENOENT;
42 memcpy(uevent_helper, page, count);
43 uevent_helper[count] = '\0';
44 if (count && uevent_helper[count-1] == '\n')
45 uevent_helper[count-1] = '\0';
46 return count;
47 }
48 KERNEL_ATTR_RW(uevent_helper);
49 #endif
50
51 decl_subsys(kernel, NULL, NULL);
52 EXPORT_SYMBOL_GPL(kernel_subsys);
53
54 static struct attribute * kernel_attrs[] = {
55 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
56 &uevent_seqnum_attr.attr,
57 &uevent_helper_attr.attr,
58 #endif
59 NULL
60 };
61
62 static struct attribute_group kernel_attr_group = {
63 .attrs = kernel_attrs,
64 };
65
66 static int __init ksysfs_init(void)
67 {
68 int error = subsystem_register(&kernel_subsys);
69 if (!error)
70 error = sysfs_create_group(&kernel_subsys.kset.kobj,
71 &kernel_attr_group);
72
73 return error;
74 }
75
76 core_initcall(ksysfs_init);
77
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